CN107725206A - A kind of preparation method of engine cylinder-body, dry liner and dry liner - Google Patents
A kind of preparation method of engine cylinder-body, dry liner and dry liner Download PDFInfo
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- CN107725206A CN107725206A CN201710823075.3A CN201710823075A CN107725206A CN 107725206 A CN107725206 A CN 107725206A CN 201710823075 A CN201710823075 A CN 201710823075A CN 107725206 A CN107725206 A CN 107725206A
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- liner
- dry
- cylinder
- endoporus
- dry liner
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 40
- 239000002994 raw material Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000007514 turning Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910019142 PO4 Inorganic materials 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 9
- 239000010452 phosphate Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 3
- 235000019628 coolness Nutrition 0.000 claims description 3
- 238000011081 inoculation Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 2
- 239000011574 phosphorus Substances 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 229910001651 emery Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000289 melt material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
This application discloses the preparation method of a kind of engine cylinder-body, dry liner and dry liner, wherein, dry liner includes liner body, and the wall thickness of liner body is 1~3mm, and the component of liner body is according to percentage by weight：C is 2.8 3.4%, and S≤0.1%, Si are 1.8 2.6%, and P≤0.25%, Mn are 0.5 0.7%, and Cr is 0.2 0.4%, and B is 0.03 0.08%, and Cu is 1.3 1.7%, surplus Fe., not only can be while thinned liner body wall thickness, it is possible to increase the mechanical performance of liner body by the component proportion.
Description
Technical field
The present invention relates to cylinder sleeve technology field, more particularly to a kind of dry liner.Further relate to a kind of dry liner
Preparation method and engine cylinder-body comprising the dry liner.
Background technology
Cylinder jacket is divided into dry liner and wet liner, and dry liner is not direct and coolant contacts, but logical
Cross contact to transmit, heat distributes through cylinder jacket, cylinder body and coolant successively.The wall thickness of dry liner is generally 2~
3.5mm.The wall thickness of dry liner is directly connected to radiating efficiency.And the wall thickness for reducing dry liner influences whether dry type
The mechanical performance of cylinder jacket.
Therefore, how while radiating efficiency is improved, the mechanical performance of dry liner is improved, becomes this area skill
Art personnel's urgent problem to be solved.
The content of the invention
In view of this, it is an object of the invention to provide a kind of dry liner, while radiating efficiency is improved, to carry
The mechanical performance of high dry liner.
It is another object of the present invention to provide a kind of preparation method of dry liner, to improve radiating efficiency
Meanwhile improve the mechanical performance of dry liner.
The present invention's has a purpose to be to provide a kind of engine cylinder-body for including the dry liner, to improve cylinder body
Radiating efficiency and mechanical performance.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of dry liner, including liner body, the wall thickness of the liner body is 1~3mm, the liner body
Component is according to percentage by weight：C is 2.8-3.4%, S≤0.1%, Si 1.8-2.6%, P≤0.25%, Mn 0.5-
0.7%, Cr 0.2-0.4%, B 0.03-0.08%, Cu 1.3-1.7%, surplus Fe.
Preferably, in above-mentioned dry liner, the matrix of the liner body is pearlite matrix, free iron
Content≤2% of ferritic.
Preferably, in above-mentioned dry liner, the graphite metallographic structure of the liner body includes A types, Type B, D
Type and E types, and the content summation of D types and E types is less than 10%, length≤200 μm of graphite metallographic structure.
Preferably, in above-mentioned dry liner, the hardness of the liner body is 260-310HB.
Preferably, in above-mentioned dry liner, tensile strength >=300Mpa of the liner body.
Preferably, in above-mentioned dry liner, the outer end of the liner body is provided with support shoulder.
Preferably, in above-mentioned dry liner, the inner of the liner body be provided be oriented to it is cylindrical.
Preferably, in above-mentioned dry liner, the integral surface of the liner body is provided with phosphate coating.
Preferably, in above-mentioned dry liner, the thickness of the phosphate coating is 0.003-0.008mm.
Present invention also offers a kind of preparation method of dry liner, including step：
S100, each raw material is taken in proportion and the melting that heats up, temperature is 1480~1520 DEG C, obtains molten raw material liquid；
S200, inovulant progress inoculation is added in molten raw material liquid；
S300, will breed after molten raw material liquid carry out spun casting, casting rotating speed be 1300~1350r/min, cast
Temperature is 1320~1420 DEG C, pours mold temperature as 350~550 DEG C, obtains liner blank part；
S400, liner blank part is machined out.
Preferably, in the preparation method of above-mentioned dry liner, the machining includes：
S401, slightly cut, thick cylindrical turning process, on the basis of the endoporus of liner blank part position clamp, remove it is cylindrical and
Both ends surplus, allowance 2.5-3mm；
S402, thick hinge endoporus process, Wall-Thickness Difference are not more than 0.6mm, allowance 1.2-1.5mm；
S403, stress relief annealing process, less than 200 DEG C shove charges, programming rate≤160 DEG C/h, it is warming up to 530 DEG C of insulations
3h, cooling velocity≤100 DEG C/h, 300 DEG C of air coolings, residual stress detected value≤20MPa；
S404, repair process, removes that support shoulder is cylindrical and upper and lower ends surplus, allowance 0.3-0.8mm；
S405, endoporus process is finish reamed, Wall-Thickness Difference is not more than 0.25mm, allowance 0.1-0.15mm；
S406, thick top gem of a girdle-pendant endoporus process, endoporus ellipse is eliminated, corrects hole taper, hole taper is not more than 0.01mm, added
Spare time amount is 0.05-0.09mm；
S407, half fine turning outer circle and fine turning outer circle, the cylindrical and both ends surplus of removal, allowance 0.08-0.15mm,
Guiding of the fine turning outer circle process processing positioned at cylinder jacket bottom is cylindrical；
S408, smart car support shoulder process, processing support shoulder position is finished product, and cuts escape, support shoulder thickness ratio
The small 0.01mm of finished size；
S409, half smart top gem of a girdle-pendant endoporus process, endoporus ellipse is eliminated, corrects hole taper, hole taper is not more than 0.01mm, added
Spare time amount is 0.01-0.03mm；
S410, smart top gem of a girdle-pendant endoporus process, diameter dimension is up to IT6 level above precision after the smart top gem of a girdle-pendant for cylinder sleeve bore, than in finished product
The big 0.01mm of hole size, cylinder sleeve Wall-Thickness Difference are not more than 0.04mm；
S411, cylindrical and fine cylindrical is roughly ground, it is smaller 0.01mm than finished product outside diameter；
S412, cylinder liner surface entirety physics and chemistry, using middle temperature phosphating, 60-75 DEG C of phosphating solution temperature, 15-25 points of phosphating time
Clock, phosphate coating thickness 0.003-0.008mm；
S413, endoporus polishing, obtain product.
Present invention also offers a kind of engine cylinder-body, including cylinder body body and dry liner, on the cylinder body body
Cylinder holes is provided with, the dry type holster is installed in the cylinder holes, and the dry liner is dry as described in any of the above item
Formula cylinder jacket.
Preferably, in above-mentioned cylinder sleeve of engine, the dry liner coordinates with the cylinder holes gap, the dry type
The lower surface of the support shoulder of cylinder jacket is supported on the end face of the cylinder holes.
Preferably, in above-mentioned cylinder sleeve of engine, the gap value between the dry liner and the cylinder holes is
0.003~0.004mm.
Compared with prior art, the beneficial effects of the invention are as follows：
In dry liner provided by the invention, the wall thickness of liner body is 1~3mm, and the component of liner body according to
Percentage by weight is that C is 2.8-3.4%, S≤0.1%, and Si 1.8-2.6%, P≤0.25%, Mn 0.5-0.7%, Cr are
0.2-0.4%, B 0.03-0.08%, Cu 1.3-1.7%, surplus Fe.By the component proportion, can not only be thinned
While liner body wall thickness, it is possible to increase the mechanical performance of liner body.
In engine cylinder-body provided by the invention, dry liner and cylinder holes gap coordinate, so as to facilitate installation and more
Change, and cylinder holes deformation will not be sent out.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of dry liner provided in an embodiment of the present invention.
Wherein, 1 be liner body, 11 be support shoulder, 12 be oriented to it is cylindrical.
Embodiment
The core of the present invention there is provided a kind of dry liner, while radiating efficiency is improved, improve dry type
The mechanical performance of cylinder jacket.
Present invention also offers a kind of preparation method for being used to prepare the dry liner, the same of radiating efficiency is being improved
When, improve the mechanical performance of dry liner.
The present invention also provides a kind of engine cylinder-body for including the dry liner, improves the radiating efficiency and machine of cylinder body
Tool performance.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1 is refer to, the embodiments of the invention provide a kind of dry liner, including liner body 1, liner body 1
Wall thickness is 1~3mm, and the component of liner body 1 is according to percentage by weight：C is 2.8-3.4%, S≤0.1%, Si 1.8-
2.6%, P≤0.25%, Mn 0.5-0.7%, Cr 0.2-0.4%, B 0.03-0.08%, Cu 1.3-1.7%, it is remaining
Measure as Fe.
The wall thickness of the dry liner is relatively thin, improves radiating efficiency, meanwhile, by the component proportion, improve cylinder sleeve
The mechanical performance of body 1.The material of liner body 1 is added 1.3%-1.7% Cu elements, formed new based on boron cast iron
High performance material.B containing 0.03%-0.08% in the material, the boron carbon of uniform net distribution is formd in material matrix
Compound, there is very strong support and anti-wear performance.Add after Cu elements, can further refine pearlite matrix, increase
The mechanical performance of casting, meets the higher explosion pressure of engine.
Further, in the present embodiment, the matrix of liner body 1 is pearlite matrix, and free ferrite contains
Amount≤2%.By the metallographic structure, the hardness of liner body 1 is improved, the hardness of liner body 1 is 260-310HB.
In the present embodiment, the graphite metallographic structure of liner body 1 includes A types, Type B, D types and E types, and D types and E types
Content summation is less than 10%, length≤200 μm of graphite metallographic structure.I.e. graphite is carried out in tissue, the ratio shared by A types and Type B
Example is larger, and the mechanical property of A types and b type eraphite is than D type and E type graphite, therefore, further by the graphite metallographic structure
Improve the mechanical property of liner body 1.Tensile strength >=300Mpa of liner body 1.
In the present embodiment, the outer end of liner body 1 is provided with support shoulder 11.Support shoulder 11 is used for axial limiting in cylinder holes
Outer end counterbore end face on.When can prevent piston " Cylinder sticking ", cylinder jacket is subjected to displacement.
Further, in the present embodiment, the inner of liner body 1 be provided with guiding cylindrical 12, be oriented to cylindrical 12 it is straight
Footpath is smaller 0.1mm than the outside diameter of the other positions of liner body 1, and the axial dimension for being oriented to cylindrical 12 is 5mm, facilitates cylinder sleeve sheet
1 body is put into the cylinder holes of engine cylinder-body.
Further, in the present embodiment, the integral surface of liner body 1 is provided with phosphate coating.Phosphate coating improves
The antifriction of dry liner running in stage at initial stage and payment.
As optimization, the thickness of phosphate coating is 0.003-0.008mm.
Present invention also offers a kind of preparation method of dry liner, for preparing the dry type in any of the above embodiment
Cylinder jacket, the preparation method comprise the following steps：
Step S100, dispensing fusing, takes each raw material in proportion and the melting that heats up, temperature are 1480~1520 DEG C, must melt
Material liquid；Dispensing is according to percentage by weight：C is 2.8-3.4%, S≤0.1%, Si 1.8-2.6%, P≤0.25%, Mn
For 0.5-0.7%, Cr 0.2-0.4%, B 0.03-0.08%, Cu 1.3-1.7%, surplus Fe.Gained is melted former
The chemical composition of feed liquid carries out quick analysis detection.
Step S200, is bred, and inovulant is added in molten raw material liquid and carries out inoculation.Preferably, bred
Before processing, molten raw material liquid is transferred in holding furnace and is incubated, temperature control is at 1400~1470 DEG C.
Step S300, casting, molten raw material liquid after breeding carry out spun casting, and casting rotating speed is 1300~
1350r/min, cast temperature are 1320~1420 DEG C, pour mold temperature as 350~550 DEG C, obtain liner blank part.After depanning,
It is put into casting frame.Casting typically uses swage spun casting mode, and in the case where the centrifugal force of high speed rotation helps, blank can
With the finer and close structure of cast iron of meeting, few shrinkage defects are fast using metal pattern molten iron cooling velocity, and tissue crystal grain refinement is more
It is readily available the physical and chemical indexs such as metallographic structure and hardness, the intensity of cylinder jacket requirement.
Step S400, liner blank part is machined out.
The wall thickness of liner body 1 can not only be thinned in the dry liner obtained by the preparation method, additionally it is possible to improve
The mechanical performance of dry liner.
In the present embodiment, machining comprises the following steps：
Step S401, slightly cut, thick cylindrical turning process, positioned and clamped on the basis of the endoporus of liner blank part, except going
Circle and both ends surplus, allowance 2.5-3mm；Process equipment is cylinder sleeve special purpose lathe HB2-030.
Step S402, thick to cut with scissors endoporus process, Wall-Thickness Difference is not more than 0.6mm, allowance 1.2-1.5mm；Process equipment
Dual spindle vertical boring machine DGT523.
Step S403, stress relief annealing process, less than 200 DEG C shove charges, programming rate≤160 DEG C/h, it is warming up to 530 DEG C of guarantors
Warm 3h, cooling velocity≤100 DEG C/h, 300 DEG C of air coolings, residual stress detected value≤20MPa；Process equipment is bench vehicle type electrical resistance furnace
RT320-6。
Step S404, repair process, removes that support shoulder 11 is cylindrical and upper and lower ends surplus, finish reams endoporus process for lower road and does
Technological preparation, process equipment are chuck type multi-tool lathe CP7620, allowance 0.3-0.8mm.
Step S405, endoporus process is finish reamed, improve inner hole precision, prepared for follow-up honing, the processing matter to finished product
Amount lays the foundation, and Wall-Thickness Difference is not more than 0.25mm, and process equipment is dual spindle vertical boring machine DGT52, allowance 0.1-
0.15mm。
Step S406, thick top gem of a girdle-pendant endoporus process, endoporus ellipse being eliminated, corrects hole taper, hole taper is not more than 0.01mm,
Allowance is 0.05-0.09mm；Process equipment is vertical great river honing machine MB4215Z.
Step S407, half fine turning outer circle and fine turning outer circle, remove cylindrical and both ends surplus, allowance 0.08-
0.15mm, guiding cylindrical 12 of the fine turning outer circle process processing positioned at cylinder jacket bottom；Process equipment is numerically controlled lathe CK7520A.
Step S408, the process of smart car support shoulder 11, processing support shoulder 11 position is finished product, and cuts escape, support shoulder 11
Thickness is smaller 0.01mm than finished size；Process equipment is numerically controlled lathe CK7520A.
Step S409, half smart top gem of a girdle-pendant endoporus process, endoporus ellipse is eliminated, corrects hole taper, hole taper is not more than
0.01mm, allowance 0.01-0.03mm；Process equipment is great river numerical control honing machine HCHM118.
Step S410, smart top gem of a girdle-pendant endoporus process, great river numerical control honing machine HCHM118, cylinder sleeve bore diameter after the smart top gem of a girdle-pendant are utilized
Size is up to IT6 level above precision, and bigger 0.01mm than finished product hole size, cylinder sleeve Wall-Thickness Difference is not more than 0.04mm, smart top gem of a girdle-pendant endoporus
Draw in the net emery stick GC230#, flat-top, polishing emery stick cork 220#, reciprocating speed be 16~26m/min, honing pressure for 25~
30bar, pulse equivalency 1-1.5mym/s.
Step S411, cylindrical and fine cylindrical is roughly ground, it is main using 60# emery wheels using high-precision coreless grinding machine MGW10200
Rotating speed 1110r/min, grinding speed 34.5m/s；The cooperation of cylinder sleeve small―gap suture is cylindrical to be machined in the process, more cylindrical than finished product
The small 0.01mm of diameter.
Step S412, cylinder liner surface entirety physics and chemistry, using middle temperature phosphating, 60-75 DEG C of phosphating solution temperature, phosphating time 15-
25 minutes, phosphate coating thickness 0.003-0.008mm.
Step S413, endoporus polishing, is polished using sponge emery stick endoporus, obtains product, in the face after polishing be able to will be seen
The reticulate pattern in face, and nethike embrane remains, it is impossible to jettisoning phosphate coating.
After product manufacturing is completed, product is measured, because dry cylinder sleeve wall thickness is very thin, seldom dynamometry also can
The great changes of measured value are caused, therefore dry liner measurement is all surveyed using octal gas, measurement diameter is obtained where core
The average value of diameter of section；The deviation from circular from of dry liner in a free state is larger, by process the center of circle that defines of section with
Situation after assembling is widely different, so the axiality of dry liner is all replaced with measuring the Wall-Thickness Difference of cylinder sleeve, axiality is public
Difference and the proportionate relationship of Wall-Thickness Difference are 1:1.
Based on the dry liner described by any of the above embodiment, the embodiment of the present invention additionally provides a kind of engine cylinder
Body, including cylinder body body and dry liner, cylinder holes is provided with cylinder body body, dry type holster is installed in the cylinder holes, and
Dry liner is the dry liner described by any of the above embodiment.
Because the wall thickness of the dry liner is relatively thin, radiating efficiency is improved, meanwhile, distributed by the group of dry liner
Than improving the mechanical performance of liner body 1, and then improve the mechanical performance and radiating efficiency of engine cylinder-body.
Further, in the present embodiment, dry liner coordinates with cylinder holes gap, the support shoulder 11 of dry liner
Lower surface is supported on the end face of cylinder holes.Dry liner coordinates with cylinder holes gap to be gently pushed into dry liner with hand
Cylinder holes after press-in without reprocessing, it is therefore prevented that cylinder holes deforms, and facilitates dismounting and change, reduces the cost of repairs.
Further, in the present embodiment, the gap value between dry liner and cylinder holes be 0.003~
0.004mm.Designed using small―gap suture interference fits, reduce cylinder prepareding gap, it can be ensured that cylinder sleeve can be answered normally after loading cylinder holes
Circle, and cylinder sleeve bore form and position tolerance is influenceed small, it is possible to reduce air leakage, do not interfere with engine power and discharge.
Specifically, in the present embodiment, gap value 0.003mm, the excircle dimension tolerance design of liner body 1 be,Corresponding to cylinder holes dimensional tolerance design isThe external diameter of liner body 1 and cylinder holes size are equidistantly divided into three simultaneously
Group, group is away from 0.009mm；This design small―gap suture coordinates, it is necessary to which cylinder holes carries out Honing process；Cylinder holes cylindricity control simultaneously exists
Within 0.01mm, because after cylinder jacket loads cylinder body, the morpheme size of cylinder holes is very big on the influence of cylinder cover inner hole ellipse situation, such as
After fruit does not control strictly cylinder holes cylindricity, cylinder jacket to load cylinder body, endoporus is oval, can increase air leakage, influence engine power
And discharge.
In the present embodiment, when gap value is 0.005mm, the excircle dimension tolerance design of liner body 1 is φIt is right
The cylinder bore dimensional tolerance design is answered to beCylinder sleeve external diameter and cylinder bore size are equidistantly divided into three groups simultaneously, group away from
0.009mm, this design small―gap suture coordinate, and cylinder bore can not use Honing process.
In the present embodiment, the hole size of liner body 1 is speciallyHole size is after press-in bodyEndoporus is divided to two groups after press fitting.
In the present embodiment, the thickness of support shoulder 11 is designed asCylinder body counterbore depth design isSupport herein
The bulge quantity that shoulder 11 protrudes cylinder body counterbore is designed as 0.03-0.09mm, after compressing cylinder head gasket, both can guarantee that the close of gas
Envelope ability, it is unlikely to cause cylinder deformation again.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (14)
1. a kind of dry liner, including liner body, it is characterised in that the wall thickness of the liner body is 1~3mm, described
The component of liner body is according to percentage by weight：C is 2.8-3.4%, S≤0.1%, Si 1.8-2.6%, P≤0.25%,
Mn is 0.5-0.7%, Cr 0.2-0.4%, B 0.03-0.08%, Cu 1.3-1.7%, surplus Fe.
2. dry liner according to claim 1, it is characterised in that the matrix of the liner body is pearlite
Matrix, content≤2% of free ferrite.
3. dry liner according to claim 1, it is characterised in that the graphite metallographic structure of the liner body includes
A types, Type B, D types and E types, and the content summation of D types and E types is less than 10%, length≤200 μm of graphite metallographic structure.
4. dry liner according to claim 1, it is characterised in that the hardness of the liner body is 260-310HB.
5. dry liner according to claim 1, it is characterised in that the tensile strength of the liner body >=
300Mpa。
6. dry liner according to claim 1, it is characterised in that the outer end of the liner body is provided with supporting
Shoulder.
7. dry liner according to claim 1, it is characterised in that it is outer that the inner of the liner body is provided with guiding
Circle.
8. dry liner according to claim 1, it is characterised in that the integral surface of the liner body is provided with phosphorus
Change layer.
9. dry liner according to claim 8, it is characterised in that the thickness of the phosphate coating is 0.003-
0.008mm。
10. a kind of preparation method of dry liner, it is characterised in that including step：
S100, each raw material is taken in proportion and the melting that heats up, temperature is 1480~1520 DEG C, obtains molten raw material liquid；
S200, inovulant progress inoculation is added in molten raw material liquid；
S300, will breed after molten raw material liquid carry out spun casting, casting rotating speed is 1300~1350r/min, cast temperature
For 1320~1420 DEG C, mold temperature is poured as 350~550 DEG C, obtains liner blank part；
S400, liner blank part is machined out.
11. the preparation method of dry liner according to claim 10, it is characterised in that the machining includes：
S401, slightly cut, thick cylindrical turning process, positioned and clamped on the basis of the endoporus of liner blank part, remove cylindrical and both ends
Surplus, allowance 2.5-3mm；
S402, thick hinge endoporus process, Wall-Thickness Difference are not more than 0.6mm, allowance 1.2-1.5mm；
S403, stress relief annealing process, less than 200 DEG C shove charges, programming rate≤160 DEG C/h, it is warming up to 530 DEG C and is incubated 3h, it is cold
But speed≤100 DEG C/h, 300 DEG C of air coolings, residual stress detected value≤20MPa；
S404, repair process, removes that support shoulder is cylindrical and upper and lower ends surplus, allowance 0.3-0.8mm；
S405, endoporus process is finish reamed, Wall-Thickness Difference is not more than 0.25mm, allowance 0.1-0.15mm；
S406, thick top gem of a girdle-pendant endoporus process, endoporus ellipse is eliminated, corrects hole taper, hole taper is not more than 0.01mm, allowance
For 0.05-0.09mm；
S407, half fine turning outer circle and fine turning outer circle, remove cylindrical and both ends surplus, allowance 0.08-0.15mm, outside smart car
Guiding of the sired results sequence processing positioned at cylinder jacket bottom is cylindrical；
S408, smart car support shoulder process, processing support shoulder position is finished product, and cuts escape, and support shoulder thickness compares finished product
The small 0.01mm of size；
S409, half smart top gem of a girdle-pendant endoporus process, it is oval to eliminate endoporus, corrects hole taper, and hole taper is not more than 0.01mm, more than processing
Measure as 0.01-0.03mm；
S410, smart top gem of a girdle-pendant endoporus process, diameter dimension is up to IT6 level above precision after the smart top gem of a girdle-pendant for cylinder sleeve bore, than finished product endoporus chi
Very little big 0.01mm, cylinder sleeve Wall-Thickness Difference are not more than 0.04mm；
S411, cylindrical and fine cylindrical is roughly ground, it is smaller 0.01mm than finished product outside diameter；
S412, cylinder liner surface entirety physics and chemistry, using middle temperature phosphating, 60-75 DEG C of phosphating solution temperature, phosphating time 15-25 minutes, phosphorus
Change thickness degree 0.003-0.008mm；
S413, endoporus polishing, obtain product.
12. a kind of engine cylinder-body, including cylinder body body and dry liner, cylinder holes is provided with the cylinder body body, it is described
Dry type holster is installed in the cylinder holes, it is characterised in that the dry liner is as described in claim any one of 1-10
Dry liner.
13. cylinder sleeve of engine according to claim 12, it is characterised in that the dry liner and the cylinder holes gap
Coordinate, the lower surface of the support shoulder of the dry liner is supported on the end face of the cylinder holes.
14. cylinder sleeve of engine according to claim 12, it is characterised in that between the dry liner and the cylinder holes
Gap value be 0.003~0.004mm.
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